Incidence of dengue and chikungunya viruses in mosquitoes and human patients in border provinces of Vietnam

Pham Thi Kim Lien, Briant Laurence, Gavotte Laurent, Labbe Pierrick, Perriat-Sanguinet Marco, Cornillot Emmanuel, Vu Trong Duoc, Nguyen Thi Yen, Tran Vu Phong, Nguyen Van Soai, Devaux Christian, Afelt Aneta, Tran Chi Cuong, Nga Phan Thi, Tran Nhu Duong, Frutos Roger. 2017. Incidence of dengue and chikungunya viruses in mosquitoes and human patients in border provinces of Vietnam. Parasites and Vectors, 10:556, 10 p.

https://doi.org/10.1186/s13071-017-2422-z

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Quartile : Q1, Sujet : TROPICAL MEDICINE / Quartile : Q1, Sujet : PARASITOLOGY

Résumé : Background: Dengue virus remains a major threat in Vietnam, while chikungunya virus is expected to become one. Surveillance was conducted from 2012 to 2014 in Vietnam to assess the presence of dengue and chikungunya viruses in patients hospitalized with acute fever in five Vietnam provinces neighboring Lao PDR and Cambodia. Surveillance was extended to mosquitoes present in the vicinity of the patients' households. Results: A total 558 human serum samples were collected along with 1104 adult mosquitoes and 12,041 larvae from 2250 households. Dengue virus was found in 17 (3%) human serum samples and in 9 (0.8%) adult mosquitoes. Chikungunya virus was detected in 2 adult mosquitoes (0.18%) while no chikungunya virus was detected in humans. Differing densities of mosquito populations were found, with the highest in the Long An Province border with Cambodia. Long An Province also displayed the lowest rate of infection, despite a very high Breteau Index, high human population density and presence of the main cross border road system. The highest incidence was found in Dac Nong Province, where the Breteau and Container indices were the second lowest. Dengue virus was detected in five Aedes albopictus, three Aedes aegypti and one Culex vishnui. Chikungunya virus was detected in two Ae. aegypti. All infected mosquitoes belonged to haplotypes described in other parts of the world and a number of novel haplotypes were found among uninfected mosquitoes. Conclusions: Dengue is considered to be regularly introduced to Vietnam from Cambodia, mostly through human movement. The data reported here provides a complementary picture. Due to intensive international trade, long-distance transportation of mosquito populations may play a role in the regular importation of dengue in Vietnam through Ho Chi Minh City. It is important to decipher the movement of mosquitoes in Vietnam, not only at the Lao PDR and Cambodia borders but also through international trade routes. Mosquito surveillance programs should address and follow mosquito populations instead of mosquito species.

Mots-clés Agrovoc : virus de chikungunya, flavivirus, épidémiologie, maladie transfrontière, Culex, Aedes albopictus, Aedes aegypti, commerce, déplacement

Mots-clés géographiques Agrovoc : République démocratique populaire lao, Cambodge, Viet Nam

Mots-clés complémentaires : Virus de la dengue, Culex vishnui

Classification Agris : S50 - Santé humaine
L73 - Maladies des animaux

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

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